Okla. Const. Schedule, § 8
All judgments and records of deeds, mortgages, liens, and other instruments, filed or recorded, affecting the title to real and personal property in the Indian Territory and Osage Indian Reservation, are hereby made as effectual to impart notice and for all other purposes under the laws of the Territory of Oklahoma extended in force in the State, as they were under the laws heretofore in force in the Indian Territory and Osage Indian Reservation.